package com.solution.common.utils;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

/**
 * 获取spingcontext 上下文环境
 * @author chenl
 * @date 2017年5月11日 上午10:49:13
 */
public class SpringContextUtils implements ApplicationContextAware {

	private static ApplicationContext applicationContext;//配置spring
	
	 
	/**
	  * 实现ApplicationContextAware接口的回调方法，设置上下文环
	  * @param applicationContext
	  * @throws BeansException
	  */
	public void setApplicationContext(ApplicationContext applicationContext)
			throws BeansException {
		SpringContextUtils.applicationContext = applicationContext;
	}
	public static ApplicationContext getApplicationContext() {
		return applicationContext;
	}
	
	/**
	 * 获取对象
	 * @param name
	 * @return以一个名字注入
	 * @throws BeansException
	 */
	public static Object getBean(String name) throws BeansException{
		return applicationContext.getBean(name);
	}
	 /**
	  * 获取类型为requiredType的对
	  * 如果bean不能被类型转换，相应的异常将会被抛出（BeanNotOfRequiredTypeException�?
	  * @param name       bean注册
	  * @param requiredType 返回对象类型
	  * @return Object 返回requiredType类型对象
	  * @throws BeansException
	  */
	  @SuppressWarnings("unchecked")
	public static Object getBean(String name, Class requiredType) throws BeansException {
	    return applicationContext.getBean(name, requiredType);
	  }
	 
	  /**
	  * 如果BeanFactory包含一个与给名称匹配的bean定义，则返回true 
	  * @param name
	  * @return boolean
	  */
	  public static boolean containsBean(String name) {
	    return applicationContext.containsBean(name);
	  }
	 
	  /**
	  * 判断以给定名字注册的bean定义是一个singleton还是个prototype
	  * 如果与给定名字相应的bean定义没有被找到，将会抛出个异常（NoSuchBeanDefinitionException  
	  * @param name
	  * @return boolean
	  * @throws NoSuchBeanDefinitionException
	  */
	  public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
	    return applicationContext.isSingleton(name);
	  }
	 
	  /**
	  * @param name
	  * @return Class 注册对象的类
	  * @throws NoSuchBeanDefinitionException
	  */
	  @SuppressWarnings("unchecked")
	public static Class getType(String name) throws NoSuchBeanDefinitionException {
	    return applicationContext.getType(name);
	  }
	 
	  /**
	  * 如果给定的bean名字在bean定义中有别名，则返回这些别名   
	  * @param name
	  * @return
	  * @throws NoSuchBeanDefinitionException
	  */
	  public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {
	    return applicationContext.getAliases(name);
	  }
}
